The TWS Market Scanners provide a quick scan of relevant markets and return the top contracts based on the instrument, parameter (Top % Gainers, Top % Losers, Most Active, etc) and filtering criteria you define. You can find the Market Scanner in Classic TWS by clicking the Analytical Tools menu option and choosing Mosaic Market Scanner or Advanced Market Scanner, and in Mosaic by clicking the New Window button followed by Mosaic Market Scanner or Advanced Market Scanner. Additional information on Mosaic Market Scanner and Advanced Market Scanner in our Users' Guide.